I'm studying Python steadily at freeCodeCamp.

In Previous article, I challenged * Time Calculator *, this time I challenged * Budget App *.

Python for Everybody
Scientific Computing with Python Projects
- Arithmetic Formatter
- Time Calculator -* Budget App (here this time) *
- Polygon Area Calculator
- Probability Calculator

Question 3: Budget App

What is required is as follows

--Creating a Category class --deposit method: deposit --withdraw method: Draw --transfer method: transfer --get_balance method: Balance display --check_funds method: Check if the money can be withdrawn --str method: Display as below

*************Food*************
initial deposit        1000.00
groceries               -10.15
restaurant and more foo -15.89
Transfer to Clothing    -50.00
Total: 923.96

--create_spend_chart method: Display as below

Percentage spent by category
100|          
 90|          
 80|          
 70|          
 60| o        
 50| o        
 40| o        
 30| o        
 20| o  o     
 10| o  o  o  
  0| o  o  o  
    ----------
     F  C  A  
     o  l  u  
     o  o  t  
     d  t  o  
        h     
        i     
        n     
        g

Personal point: Formatting with format

It is necessary to fully use the str.format method in order to arrange the format nicely with the str method and create_spend_chart method of the Category class.

Various format specifications

--Index number --'{0} {1} {0}'.format ('banana','apple') ---> Banana Apple Banana --Character alignment / padding --Right justified: '{:> 20}'.format ('test') - -> '○○○○○○○○○○○○○○○○test' --Left justified: '{: <20}'.format ('test') - -> 'test○○○○○○○○○○○○○○○○' --Centered: '{: ^ 20}'.format ('test') - -> '○○○○○○○○test○○○○○○○○' --If you want to fill in the whitespace with some characters: '{:-> 20}'.format ('test') - -> '----------------test' --Zero padding: '{: 010d}'. format (100) - -> '0000000100' --Specify the number of digits after the decimal point - '{:.2f}'.format(1.234567) - ->　'1.23'

Implementation of str method of Category method

*************Food************* 　<-header
initial deposit        1000.00 -|
groceries               -10.15  |-body
restaurant and more foo -15.89  |
Transfer to Clothing    -50.00 -|
Total: 923.96                   <-total

Let's divide it into three parts: header, body, and total. The conditions are as follows

--Header is 30 characters --The explanation on the left side of the body is up to 23 characters, and the amount on the right side is up to 7 characters, displaying up to the second decimal place.

category_name = 'Food'
ledger = [...] #List of objects with amount and description

def __str__(self):
    header = '{:*^30}'.format(category_name)
    body = ['{:<23}{:>7.2f}'.format(item.description, item.amount) for item in ledger]
    total = sum([item.amount for item in ledger])

    return header + '\n' + '\n'.join(body) + '\n' + 'Total: {}'.format(total)

Finally

It was refreshing because I don't usually visualize it with console output. Please try the create_spend_chart method.

The next issue is * Polygon Area Calculator *.